Optical investigation of supernova remnant G206.7+5.9
Monthly Notices of the Royal Astronomical Society, vol.537, no.3, pp.2412-2421, 2025 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 537 Issue: 3
- Publication Date: 2025
- Doi Number: 10.1093/mnras/staf172
- Journal Name: Monthly Notices of the Royal Astronomical Society
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Compendex, INSPEC, zbMATH, Directory of Open Access Journals
- Page Numbers: pp.2412-2421
- Keywords: ISM: evolution, ISM: individual objects: G206.7+5.9, ISM: structure, ISM: supernova remnants
- Süleyman Demirel University Affiliated: Yes
Abstract
The shell-type supernova remnant (SNR) G206.7+5.9 was recently discovered in the radio band with the Five-hundred-meter Aperture Spherical Radio Telescope. The remnant spans about 3.5° in diameter and exhibits bilateral shells. In this work, we present optical spectra of G206.7+5.9 with the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST), and narrow-band (and [S ii]) images with the 1-m T100 telescope. The filamentary structure seen in the image shows a clear correlation with the radio emission. We use optical line ratios to determine the physical parameters of G206.7+5.9. The LAMOST spectra reveal large ratios of [S ii]/Hα- (0.61-1.78) and [N ii]α- (0.63-1.92) consistent with that expected for a shock-heated SNR. The emission lines [O i] λ λ6300, 6363 detected in the spectra also support the presence of shocks. Electron density (nc) measurements based on the [S ii] 6716/6731 ratio suggest densities between 117 and 597 cm-3. We estimate the pre-shock cloud density (nc) to be approximately 2.6-13.3 cm-3. We also investigate the archival H i data and have newly identified an expanding gas motion of the H i, whose velocity span is approximately 10 km s-1. We conclude that G206.7+5.9 is an SNR exhibiting properties remarkably similar to those seen in Galactic SNRs.